I was reading some existing threads here that closely followed my symptoms as I was experiencing intermittent loss of 1-2-3 gears. This issue started after I was doing some spirited driving in manual mode and would come and go intermittently with a ignition power cycle.
Can't even drive in forwards. the Trans Fail caption is illuminated. I believe that the ZF trans clutches for 1/2/3 disengaged and the trans is locked in 4th gear When in D. And still has reverse in R.
When the symptom appears, 1-2-3 has no drive torque. Not slipping per say, as there is no drive engagement. When shifting into Drive, I got neutral, and once throttle input engine speed goes passed the specified maximum engine speed without wheel movement, transmission failsafe mode is engaged which shifts immediately into 4 gear, I can see it when I select manual mode. Intermittently when cold started, I had 1,2,3 gear normal shifting without any issue. Over time intermittent became permanent loss of 1-2-3 gears. And before losing the first 3 gears intermittently I was experiencing intermittent signal loss from the gear select module where I could not select between drive and reverse after starting up. There would be no square selected around either PRND. I replaced the shift select module and this issue did not return. After replacing my fluid, filter and a new valve body, I went for a test drive, and had all the gears as normal. Once I started to boot on it I lost the 1-2-3 gears and speed failsafe mode engaged. After this event, I could not get the 1-2-3 gears back even after a cold start. The torque converter is strong and there's nothing showing an issue with brake on stall speed tests. You can see it on the video when I test reverse and drive mode. Early in the video you can see after selecting 1 the engine revs up and then transmission goes to failsafe and shifts to 4, it then went to 5 just because I selected that gear with the shifter.
video
https://photos.app.goo.gl/cgyfTHUPdrPhUMft5
I decided to order and install a new rebuilt valve body and perform a service. I used AMS automatic transmission signature series oil, and new replacement filter.
Parts List:
Valve body, rebuilt, revmax V5HP24D
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Filter, PA CARGO 114710
https://www.rockauto.com/en/moreinfo...=1411737&jsn=1
Transmission oil, AMS ATFPK
https://www.amsoil.com/p/signature-s...ion-fluid-atf/
I was really
disappointed in the quality of the RevMax valve body - there was a critical and obvious flaw on re-assembly the technicians and quality checking persons didn't notice see attached photo. Furthermore ordering the part from the revmax website
did not work and I could not complete their stupid forms to make my order without getting an error, so I had to order the valve body from amazon. I didn't notice the flaw on the manual selector spool valve either until I was on the final assembly stages after I had bolted it on the transmission. The spool valve to select the gears was not installed correctly so it could not connect to the driven cable from the shifter.
Things I have done that follow what others suggested here based on searching for symptoms.
Issue with No box around the PNRD, failsafe. CHanged the gear select module with part
https://www.ecstuning.com/b-genuine-...h/24107512755/
And this particular symptom has not returned. Removed and inspected transmission harness connector, there is no corrosion on any pins.
Replaced the valve body, fluid, filter.
relevant codes from ista-D
0x00003B EGS: Stall speed
0x00008D IKE: EGS signal line disturbed
DME/DDE
- 0xDC (220)
DME: CAN timeout, electronic transmission management (EGS/AGS)
DSC
- 0x3A (58)
DSC: No message from EGS control unit
EGS
- 0x4 (4)
EGS: Pressure actuator EDS 4
- 0x1 (1)
EGS: Pressure actuator EDS 1
- 0x12 (18)
EGS: Solenoid valve 3
- 0x11 (17)
EGS: Solenoid valve 2
- 0x10 (16)
EGS: Solenoid valve 1
KOMBI
- 0xFB (251)
IKE: No CAN identification (EGS)
- 0x8D (141)
IKE: EGS signal line disturbed
attachments;
old valve body
rebuilt valve body
rebuilt valve body flaw i had to correct